People who believe that LTSC is a magic solution are the same level of delusional as people who believe that Win7 is best and 10/11 is spyware. Even if you go with Win10 LTSC 2021 IoT which is supported until 2032, you will run into some sort of incompatibilities because you'll be running kernel 19044.1288 when some software will rely on a Win11 kernel that's 22000 and up.
LTSC IoT is specifically meant for shit like self-checkout cash registers and McDonalds kiosks and nothing more, not for daily driving it like a consumer OS. If you spent all the time bitching and moaning about how bad Win10/11 is to just learn how to unfuck it you'd be better off. You do it once and then you forget you're running teh ebil Win10/11 Pro.
Or, you know, stay on Win7/10 LTSC until the end of time, just don't get pissy when people laugh at the issues you cause for yourself by your stubbornness.